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- #!/usr/bin/perl
- ## -----------------------------------------------------------------------
- ##
- ## Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
- ##
- ## This program is free software; you can redistribute it and/or modify
- ## it under the terms of the GNU General Public License as published by
- ## the Free Software Foundation, Inc., 53 Temple Place Ste 330,
- ## Boston MA 02111-1307, USA; either version 2 of the License, or
- ## (at your option) any later version; incorporated herein by reference.
- ##
- ## -----------------------------------------------------------------------
-
- ##
- ## lss16toppm:
- ## Convert an LSS-16 image to PPM
- ##
- ## Usage:
- ##
- ## lss16toppm [-map] < file.lss > file.ppm
- ##
- ## The -map causes the color map to be output on stderr.
- ##
-
- eval { use bytes; };
- eval { binmode STDIN; };
- eval { binmode STDOUT; };
-
- $map = 0;
- foreach $arg ( @ARGV ) {
- if ( $arg eq '-map' ) {
- $map = 1;
- } else {
- print STDERR "$0: Unknown option: $arg\n";
- exit 127;
- }
- }
-
- if ( read(STDIN, $header, 56) != 56 ) {
- print STDERR "$0: Short file\n";
- exit 1;
- }
-
- ($magic, $xsize, $ysize, @colorset) = unpack("Vvvc48", $header);
-
- if ( $magic != 0x1413f33d ) {
- print STDERR "$0: Invalid file format\n";
- exit 1;
- }
-
- %color = ();
- for ( $i = 0 ; $i < 16 ; $i++ ) {
- $r = int((shift @colorset) * 255 / 63 + 0.5);
- $g = int((shift @colorset) * 255 / 63 + 0.5);
- $b = int((shift @colorset) * 255 / 63 + 0.5);
-
- $color{$i} = pack("ccc", $r, $g, $b);
-
- if ( $map ) {
- printf STDERR "#%02x%02x%02x=%d\n", $r, $g, $b, $i;
- }
- }
-
- sub get_nybble() {
- my($ch,$n);
- if ( defined($nybble_buf) ) {
- $n = $nybble_buf;
- undef $nybble_buf;
- } else {
- if ( read(STDIN, $ch, 1) != 1 ) {
- print STDERR "$0: Short read on input (file corrupt)\n";
- exit 1;
- }
- $ch = ord($ch);
- $nybble_buf = $ch >> 4;
- $n = $ch & 0xF;
- }
- return $n;
- }
-
- print "P6\n";
- print "$xsize $ysize\n";
- print "255\n";
-
- for ( $y = 0 ; $y < $ysize ; $y++ ) {
- $x = 0;
- $last = 0;
- undef $nybble_buf; # Nybble buffer starts clear on each line
- while ( $x < $xsize ) {
- $n = get_nybble();
-
- if ( $n != $last ) {
- print $color{$n};
- $last = $n;
- $x++;
- } else {
- $c = get_nybble();
- if ( $c == 0 ) {
- # Double-nybble run
- $c = get_nybble();
- $c += get_nybble() << 4;
- $c += 16;
- }
- # Truncate overlong runs
- $c = $xsize-$x if ( $c > $xsize-$x );
- # Output run
- print $color{$n} x $c;
- $x += $c;
- }
- }
- }
-